کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4916473 1428095 2017 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermodynamic and economic investigation of a screw expander-based direct steam generation solar cascade Rankine cycle system using water as thermal storage fluid
ترجمه فارسی عنوان
تحلیل ترمودینامیک و اقتصادی یک سیستم چرخه رانکین با استفاده از آب به صورت مایع حرارتی
کلمات کلیدی
تولید انرژی حرارتی خورشیدی، گسترش دهنده پیچ، ذخیره سازی حرارتی، باطری بخار، رفتار باربری،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
چکیده انگلیسی
Solar electricity generation system (SEGS) which employs cascade steam-organic Rankine cycle (SORC) and steam screw expander (SE) is promising due to the high efficiency at moderate heat source temperature. This paper puts a special emphasis on heat storage and thermo-economic evaluation. Preferable operating temperature of the system is first clarified on the basis of SE characteristics. The temperature-dependent permissible stress of steam accumulator is modelled and the capital cost is investigated. Comparison between the direct steam generation (DSG) SEGS and an indirect one using thermal oil is made at a power capacity of 1 MW and storage of 6.5 h. The results indicate the DSG system has both thermodynamic and economic superiorities. The hot side temperature (TH) of SORC generally does not exceed 250 °C to achieve an optimum solar thermal power efficiency. Given radiation of 750 W/m2, the maximum efficiency (ηT,m) is 14.3% with a corresponding TH around 240 °C. The material cost of pressure vessels is 2.55 million RMB. For the indirect system, the optimal TH is about 230 °C and ηT,m approximates to 13.2% and the estimated oil cost is 7.92 million RMB. It is recommended to adopt steam accumulators in the SE-driven SEGS.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 195, 1 June 2017, Pages 137-151
نویسندگان
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